There are three layers of the eyeball. The three layers are the sclera, the choroid, and the retina. The layers can also be called tunics, but if they are called tunics they are known as the fibrous, the pigmented, and the visual. The fibrous, sclera, choroid and the pigmented are vascular; and the retina and visual are not vascular. The white part of the eye is known as the sclera. Calogen gives the sclera the white color.
The autonomic nervous system regulates the pupil's diameter. The parasympathetic nerve impulse causes the circular muscles to contract which allows less light to enter the eye. The sympathetic nerve impulse causes the muscles to dilate, allowing more light in.
The cornea has no blood vessels. The lens are made up of protein.The fovea is the focus point in the eye. Since the lens are concave as well as the cornea, the ligaments attached to the lens tighten in order to make the lens flat and loosen in order to allow the lens to be more concave. This ability helps make the object you are seeing clear.
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